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ATMEGA168PA-MU

Public Made by Adom

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Microchip Tech MICROCHIP, VQFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ATMEGA168PA-MU

Microchip Tech · MICROCHIP · VQFN-32-EP(5x5)

ATMEGA168PA-MU from Microchip Tech, in a VQFN-32-EP(5x5). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 PD3/INT1/OC2B/PCINT19 bidirectional Port D bit 3 is a bidirectional I/O pin with internal pull-up that is tri-stated on reset, also serving as external interrupt 1 input and OC2B output.
2 PD4/XCK/T0/PCINT20 bidirectional Port D bit 4 is a bidirectional I/O pin with internal pull-up that is tri-stated on reset, also serving as USART external clock XCK and Timer/Counter0 input T0.
3 GND power_in Ground reference for the digital supply.
4 VCC power_in Digital supply voltage; the operating range is 2.7V to 5.5V.
5 GND power_in Ground reference for the digital supply.
6 VCC power_in Digital supply voltage; the operating range is 2.7V to 5.5V.
7 PB6/XTAL1/TOSC1/PCINT6 bidirectional Port B bit 6 serves as the chip clock oscillator input XTAL1 or timer oscillator TOSC1 depending on the clock fuse settings, and cannot be used as I/O when used as a clock pin.
8 PB7/XTAL2/TOSC2/PCINT7 bidirectional Port B bit 7 serves as the inverting oscillator amplifier output XTAL2 or timer oscillator TOSC2 depending on the clock fuse settings, and cannot be used as I/O when used as a clock pin.
9 PD5/T1/OC0B/PCINT21 bidirectional Port D bit 5 is a bidirectional I/O pin with internal pull-up that is tri-stated on reset, also serving as Timer/Counter1 external counter input T1 and OC0B output.
10 PD6/AIN0/OC0A/PCINT22 bidirectional Port D bit 6 is a bidirectional I/O pin that serves as analog comparator positive input AIN0 (pull-up should be off in that use) and OC0A output.
11 PD7/AIN1/PCINT23 bidirectional Port D bit 7 is a bidirectional I/O pin that serves as analog comparator negative input AIN1 (pull-up should be off in that use).
12 PB0/ICP1/CLKO/PCINT0 bidirectional Port B bit 0 is a bidirectional I/O pin with internal pull-up that is tri-stated on reset, also serving as Timer/Counter1 input capture ICP1 and divided clock output CLKO.
13 PB1/OC1A/PCINT1 bidirectional Port B bit 1 is a bidirectional I/O pin with internal pull-up that is tri-stated on reset, also serving as Timer/Counter1 output compare A output OC1A.
14 PB2/SS/OC1B/PCINT2 bidirectional Port B bit 2 is a bidirectional I/O pin with internal pull-up that is tri-stated on reset, also serving as SPI slave select SS and Timer/Counter1 output compare B output OC1B.
15 PB3/MOSI/OC2A/PCINT3 bidirectional Port B bit 3 is a bidirectional I/O pin with internal pull-up that is tri-stated on reset, also serving as SPI MOSI and Timer/Counter2 output compare A output OC2A.
16 PB4/MISO/PCINT4 bidirectional Port B bit 4 is a bidirectional I/O pin with internal pull-up that is tri-stated on reset, also serving as SPI master input/slave output MISO.
17 PB5/SCK/PCINT5 bidirectional Port B bit 5 is a bidirectional I/O pin with internal pull-up that is tri-stated on reset, also serving as SPI clock SCK.
18 AVCC power_in Supply voltage pin for the A/D converter, PC3:0 and ADC7:6, which should be connected to VCC even if the ADC is not used.
19 ADC6 input Analog input channel 6 of the 10-bit A/D converter, powered from the analog supply (TQFP and QFN package only).
20 AREF input Analog reference pin for the A/D converter.
21 GND power_in Ground reference for the digital supply.
22 ADC7 input Analog input channel 7 of the 10-bit A/D converter, powered from the analog supply (TQFP and QFN package only).
23 PC0/ADC0/PCINT8 bidirectional Port C bit 0 is a 7-bit port pin that is tri-stated on reset, also serving as ADC input channel 0 using analog power.
24 PC1/ADC1/PCINT9 bidirectional Port C bit 1 is a port pin that is tri-stated on reset, also serving as ADC input channel 1 using analog power.
25 PC2/ADC2/PCINT10 bidirectional Port C bit 2 is a port pin that is tri-stated on reset, also serving as ADC input channel 2 using analog power.
26 PC3/ADC3/PCINT11 bidirectional Port C bit 3 is a port pin that is tri-stated on reset, also serving as ADC input channel 3 using analog power.
27 PC4/ADC4/SDA/PCINT12 bidirectional Port C bit 4 is a port pin that is tri-stated on reset, also serving as 2-wire serial data SDA and ADC input channel 4 using digital power.
28 PC5/ADC5/SCL/PCINT13 bidirectional Port C bit 5 is a port pin that is tri-stated on reset, also serving as 2-wire serial clock SCL and ADC input channel 5 using digital power.
29 PC6/RESET/PCINT14 input When the RSTDISBL fuse is unprogrammed this pin is an active-low reset input, and a low level longer than the minimum pulse length generates a reset; when programmed it acts as I/O with electrical characteristics differing from other port C pins.
30 PD0/RXD/PCINT16 bidirectional Port D bit 0 is a bidirectional I/O pin that serves as USART receive data input RXD when the USART receiver is enabled.
31 PD1/TXD/PCINT17 bidirectional Port D bit 1 is a bidirectional I/O pin that serves as USART transmit data output TXD and is configured as an output whenever the USART transmitter is enabled.
32 PD2/INT0/PCINT18 bidirectional Port D bit 2 is a bidirectional I/O pin that serves as external interrupt source 0 INT0.
33 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package VQFN-32-EP(5x5)
Category Embedded Processors & Controllers
Pins 33

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Operating temperature -55 125 °C 268
Storage temperature -65 150 °C 268
Voltage on any pin except RESET with respect to ground -0.5 V 268
Voltage on RESET with respect to ground -0.5 13 V 268
Maximum operating voltage 6 V 268
DC current per I/O pin 40 mA 268
DC current VCC and GND pins 200 mA 268
Supply voltage VCC 2.7 5.5 V TA = -40°C to 125°C 269
Input leakage current I/O pin (low) IIL 1 µA VCC = 5.5V, pin low (absolute value) 269
Input leakage current I/O pin (high) IIH 1 µA VCC = 5.5V, pin high (absolute value) 269
Reset pull-up resistor RRST 30 60 k VCC = 5V, Vin = 0V 269
I/O pin pull-up resistor RPU 20 50 k 269
Analog comparator input offset voltage VACIO 40 mV VCC = 5V, 0.1VCC < Vin < VCC - 100mV 269
Analog comparator input leakage current IACLK -50 50 nA 0.1VCC < Vin < VCC, 100mV 269
Output low voltage except RESET pin (20mA) VOL 0.8 V IOL = 20mA, VCC = 5V 269
Output low voltage except RESET pin (5mA) VOL 0.5 V IOL = 5mA, VCC = 3V 269
Output high voltage except reset pin (20mA) VOH 4.1 V IOH = -20mA, VCC = 5V 269
Output high voltage except reset pin (10mA) VOH 2.3 V IOH = -10mA, VCC = 3V 269
Active supply current 4MHz ICC 1.3 2.4 mA Active 4MHz, VCC = 3V 270
Active supply current 8MHz ICC 4.6 10 mA Active 8MHz, VCC = 5V 270
Active supply current 16MHz ICC 8.4 16 mA Active 16MHz, VCC = 5V 270
Idle supply current 4MHz ICC 0.2 0.6 mA Idle 4MHz, VCC = 3V 270
Idle supply current 8MHz ICC 0.9 1.6 mA Idle 8MHz, VCC = 5V 270
Idle supply current 16MHz ICC 1.8 4 mA Idle 16MHz, VCC = 5V 270
Power-down current WDT enabled 3V ICC 4.2 44 µA Power-down mode, WDT enabled, VCC = 3V 270
Power-down current WDT enabled 5V ICC 6.2 66 µA Power-down mode, WDT enabled, VCC = 5V 270
Power-down current WDT disabled 3V ICC 0.8 40 µA Power-down mode, WDT disabled, VCC = 3V 270
Power-down current WDT disabled 5V ICC 1.1 60 µA Power-down mode, WDT disabled, VCC = 5V 270
Calibrated internal RC oscillator accuracy (factory, 3V) -1 1 % 8.0MHz, 3V, 25°C 271
Calibrated internal RC oscillator accuracy (2.7-5.5V) -14 14 % 8.0MHz, VCC 2.7V to 5.5V, -40°C to 125°C 271
Calibrated internal RC oscillator accuracy (factory, 5V) -1 1 % 8.0MHz, 5V, 25°C 271
Calibrated internal RC oscillator accuracy (4.5-5.5V) -10 10 % 8.0MHz, VCC 4.5V to 5.5V, -40°C to 125°C 271
Watchdog oscillator accuracy -40 40 % 128kHz, VCC 2.7V to 5.5V, -40°C to 125°C 271
Oscillator frequency (external clock, 2.7-5.5V) 1/tCLCL 0 8 MHz VCC = 2.7 - 5.5V 271
Oscillator frequency (external clock, 4.5-5.5V) 1/tCLCL 0 16 MHz VCC = 4.5 - 5.5V 271
Bandgap reference voltage VBG 1 1.1 1.2 V 272
Power-on reset threshold voltage (falling) VPOT 0.6 1.3 1.6 V 272
BOD trigger level VBOT (BODLEVEL 110) VBOT 1.6 1.8 2 V BODLEVEL 2:0 = 110 272
BOD trigger level VBOT (BODLEVEL 101) VBOT 2.5 2.7 2.9 V BODLEVEL 2:0 = 101 272
BOD trigger level VBOT (BODLEVEL 100) VBOT 3.9 4.3 4.6 V BODLEVEL 2:0 = 100 272
Output low voltage two-wire bus VOL 0 0.4 V 3mA sink current 275
Input current each I/O pin two-wire bus Ii -10 10 µA 0.1VCC < Vi < 0.9VCC 275
SCL clock frequency fSCL 0 400 kHz fCK > max(16fSCL, 250kHz) 275
ADC resolution 10 Bits -40°C to 125°C, 2.70V to 5.50V, ADC clock = 200kHz 276
ADC absolute accuracy TUE TUE 2.2 3.5 LSB VCC = 4V, VREF = 4V 276
ADC integral non-linearity INL 0.6 1.5 LSB VCC = 4V, VREF = 4V 276
ADC differential non-linearity DNL 0.3 0.7 LSB VCC = 4V, VREF = 4V 276
ADC gain error -4 3 LSB VCC = 4V, VREF = 4V 276
ADC offset error -3.5 3.5 LSB VCC = 4V, VREF = 4V 276
ADC clock frequency 50 200 kHz 276
Internal voltage reference VINT VINT 1 1.1 1.2 V 276
Reference input resistance RREF 22 32 42 k 276

CAD (KiCad official)

  • Symbol: ATMEGA168PA-MU
  • Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • 3D model: VQFN-32-EP(5x5) (KiCad packages3D, STEP)
  • 3D model files: atmega168pa-mu-etched.step / atmega168pa-mu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega168pa-mu.step / atmega168pa-mu.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Microchip Tech datasheet (326 pp, sha256 626d81e6d4d566ae, retrieved 2026-10-27, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF